EP2719157A1 - System and method for position calibration of a spot of an optical sensor - Google Patents
System and method for position calibration of a spot of an optical sensorInfo
- Publication number
- EP2719157A1 EP2719157A1 EP11729392.8A EP11729392A EP2719157A1 EP 2719157 A1 EP2719157 A1 EP 2719157A1 EP 11729392 A EP11729392 A EP 11729392A EP 2719157 A1 EP2719157 A1 EP 2719157A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spot
- sheet
- sensor
- color
- patch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/047—Detection, control or error compensation of scanning velocity or position
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00007—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for relating to particular apparatus or devices
- H04N1/00018—Scanning arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00026—Methods therefor
- H04N1/00034—Measuring, i.e. determining a quantity by comparison with a standard
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00026—Methods therefor
- H04N1/00045—Methods therefor using a reference pattern designed for the purpose, e.g. a test chart
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00026—Methods therefor
- H04N1/0005—Methods therefor in service, i.e. during normal operation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00026—Methods therefor
- H04N1/00063—Methods therefor using at least a part of the apparatus itself, e.g. self-testing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00071—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for characterised by the action taken
- H04N1/00082—Adjusting or controlling
- H04N1/00087—Setting or calibrating
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
- H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
- H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
- H04N1/6044—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis involving a sensor integrated in the machine or otherwise specifically adapted to read the test pattern
Definitions
- Obtaining accurate color measurements typically depends on the precise positioning of the sensor over the printed area. Inaccurate position may result in the sensor not measuring accurately a consistent patch and may therefore lead to in accu rate or i ncon s istent measurements. Obviously, the accuracy requirements increase as the printed patches decrease in size. Since the press set-up state may degrade over time as consumables age and other process variables change, the resulting color may also alter over time. To prevent and control this color drift, and to increase color consistency both over time within a single press and job and across presses, a Continuous Color Calibration (CCC) process was developed in which a set of calibration patches is printed on each sheet in a job alongside the customer's content.
- CCC Continuous Color Calibration
- Fig. 1 illustrates a system for determining a position of a densitometer sensor with respect to a known position on a print for continuous self- calibration.
- Fig. 2 illustrates a position calibration patch.
- Fig. 3 is a line chart of optical density values sampled by an optical sensor vs. position of the sensor with respect to a position calibration patch.
- a system and method for determining a position of a densitometer sensor with respect to a known position on a print for continuous self-calibration is disclosed herein. Such system and method may facilitate precise sensor placement so as to maintain the sensor's field of view (also referred to as the spot of the sensor) within desired confines.
- a single position calibration patch may be used, thus allowing positioning self position calibration to be performed on virtually any printed sheet (or on any predefined number of printed sheets).
- Fig. 1 illustrates a system 100 for determining a position of a densitometer sensor with respect to a known position on a print for continuous self-calibration.
- Sheet 1 13 is presented in a facing orientation so as to present the features present on that sheet, while printer 120 is shown in a side view, but it is to be understood that optical sensor 106 is designed to scan across sheet 1 13 along scanning path 108 as sheet 1 13 (or printer 120) moves in the direction of scan.
- System 100 may include printer 120, with printing assembly 1 18 (such as, for example one or more printing heads or a print drum) which are configured to print on sheet 1 13.
- Sheet 1 13 may be, for example, a sheet fed from a tray carrying a stack of one or more sheets, a continuous sheet (also known as "web"), of any appropriate size, suitable for printing by printer 120.
- Printing assembly 1 18 may typically be configured to print anywhere on sheet 1 13. Specifically, printing assembly 1 18 may be designed to print text, graphics or any printable items within designated printing area 1 12, as well as on any other areas on sheet 1 13.
- Color calibration strip 1 14 may be provided on sheet 1 13, typically printed by printer 120 (but this is not a requirement, as it may be printed on sheet 1 13 by another printer or otherwise provided on sheet 1 13, and not necessarily by printer 120).
- color strip 1 14 may include blocks 1 16 (also referred to as "patches") of different colors, which are used for color calibration or the like and are typically supposed to be sampled by optical sensor 106, such as, for example, a densitometer sensor (consider, as an example, densitometer model DTP24, marketed by X-Rite Inc., Grand Rapids, Michigan, USA).
- a densitometer is a device that measures the degree of darkness (also termed as "optical density") of a photographic or semitransparent material or of a reflecting surface. Densitometers are commonly used for color calibration. The aim of color calibration is to measure or adjust the color response of an input or output device (e.g. a printer) to establish a known relationship to a standard color space (e.g. CIELAB, CMYK, RGB).
- a standard color space e.g. CIELAB, CMYK, RGB
- Optical sensor 106 may be coupled to displacing member 104 (e.g. an electrical motor that is configured to engage with optical sensor 106 via a transmission gear), designed to move optical sensor 106 and position it at any desired position along axis 1 19, which is substantially perpendicular to scan path 108.
- Position calibration patch 1 12 may be provided on sheet 1 13 at a known position with respect to a reference position.
- the reference position may be, for example, the position of color calibration strip 1 14, the position of a feature of color calibration strip 1 14 (e.g. the position of any of its color patches 1 16), or any other reference position.
- position calibration patch 1 12 may be positioned on sheet 1 13 anywhere along the scanning path 108.
- position calibration patch 1 12 may be positioned on sheet 1 13 anywhere along the scanning path 108.
- 1 12 may be position in front color calibration strip 1 14, behind at any other position along it, as well as separately from color calibration strip 1 14.
- position calibration patch 1 12 may be positioned away from scan path 108 at a known position with respect to a reference position, but that would require that optical sensor 106 be provided with a displacing arrangement so as to allow its displacement with respect to sheet
- sheet 1 13 (e.g. by displacing member 104) or that sheet 1 13 be provided with a displacing arrangement so as to allow its displacement with respect to sensor 106 (e.g. by moving feed tray 122 perpendicularly with respect to the scanning direction).
- Printer 120 may include controller 102, which may include processor 101 for executing programs or process data, e.g. programs for executing a method for position calibration of the spot of a sensor, such as described herein and other such methods.
- the controller 102 may also include memory 105 for short term use, non-transitory storage device 107 for long-term storage of executable programs and data, and input/output (I/O) interface 103 for interfacing printer 120 with other input or output devices.
- I/O input/output
- Position calibration patch 200 may include two or more adjacent blocks (e.g. where each two adjacent blocks have a common edge) of different colors.
- position calibration patch 200 includes three adjacent color blocks: a first side color block 202 located at a first lateral side of the position calibration patch, a second side color block 206 located at a second lateral side of the position calibration patch and a third intermediary color block 204 located between first side color block 202 and second side color block 206.
- the lateral width (i.e. perpendicular to scanning path 108, shown in Fig. 1 ) of any or all of the color blocks of position calibration patch 200 may be selected so as to predetermine all possible coverage possibilities of the color blocks by spot 210 of the optical sensor (106, Fig. 1 ).
- the center of the spot is denoted by 205.
- width b of intermediary color block 204 may be selected to be slightly greater than the lateral width of spot 210 (which, in the case of a circle, is twice radius R), so that at any time spot 210 covers an area that is confined within intermediary color block or covers an area which includes a portion of intermediary color block 204 and either of the side color blocks (202, 206), but not both.
- the lateral widths a and c of side color blocks 202 and 206 may be, in this example, of any size (i.e., smaller or greater than lateral width b).
- Position calibration patch 200 may present blocks of different colors.
- the different colors may comprise the primary colors of a selected color space (e.g. Cyan, Magenta, Yellow and Black for the CMYK color space). Although other different colors may be used, it may be advantageous to select primary colors, so as to allow the optical sensor to clearly distinct them.
- a position calibration patch may include just two color blocks.
- a position calibration patch may include two color blocks provided on the sheet, while the background color of the sheet serves as a third color block.
- Fig. 3 is a line chart of optical density values sampled by an optical sensor vs. position of the sensor with respect to a position calibration patch. Shown are normal (continuous line 302) optical density readings and high optical density readings (dashed line 304), indicating the relative coverage of magenta in the position calibration patch of Fig. 2 (in percentage) with respect to the position of the optical sensor (in mm).
- Normal optical density (OD) refers to an OD value which is set to the ink OD set-point value. This value is typically fixed and predetermined according to the ink properties and the gloss level of the substrate on which it is printed on.
- “High” OD refers an OD value which is higher than the specific ink's OD set-point.
- the "position” refers to the position of the center of the sensor spot (205, see Fig. 2).
- the position calibration patch was printed and sampled twice using two different OD values, "Normal OD” which is the regular set point for each solid and "High OD” which is higher than the solids OD regular set points. These tests were conducted on an offline robot.
- the output is a function that maps the sensor's position with respect to the relative coverage of Magenta by the sensor's spot. Using this function, it may be possible to determine the position of the sensor (actually the spot of the sensor). In some embodiments, the sensor may be moved so as to obtain a desired position accordingly.
- a method or system for position calibration is based on calculating the Magenta and Cyan (or Yellow) coverage within the measured area of the sensor's spot. Knowing the relative coverage (i.e. Magenta coverage with respect to the spot containing the two participating colors allow a rather accurate determination of the sensor's spot position over the patch and therefore, over an entire color calibration strip aligned with the position calibration patch.
- DA dot area
- OD C yan/ y eiiow is the optical density of cyan or yellow
- OD mage nta is the optical density of magenta
- OD samp ie is the optical density of the sampled position calibration patch.
- the position of the optical sensor with respect to the reference position may be determined.
- the term "known geometry” is understood, in the context of the present application, to include the shape and dimensions of the spot. [0039] This may be demonstrated by considering the position calibration patch shown in Fig. 2, and the optical sensor spot that has in that case a circular shape. For this set up, the following relation may be used, defining the relation between DA, radius R of the spot and distance y, which is, in this example, the distance between the border line between magenta and cyan (that may serve as a reference position) and the center of the circular spot:
- equation (2) corresponds to a circular spot having radius R and to a position calibration patch with color blocks that share a linear border line.
- a spot and/or position calibration patch of other geometric properties may require the use of another equation defining the proper relation between the position of the spot (i.e. the position of the optical sensor) and DA.
- Fig. 4 illustrates a method 400 for determining a position of a spot of an optical sensor of a known geometry traveling along a scan path across a sheet, with respect to a reference position on the sheet.
- traveling it is meant to refer to a situation where the sensor is stationary and the sheet is travelling, a situation where the sheet is stationary and the sensor is traveling and a situation where both the sheet and the sensor are traveling, all which create a relative motion between the sensor (or the spot of the sensor) and the sheet, effectively causing the spot to travel along the scan path across the sheet.
- Such a method may generally include providing 402 a position calibration patch on the sheet at a position along the scan path which is known with respect to the reference position, the patch comprising at least two blocks of different colors.
- the method may also include obtaining 404 a sampling of the position calibration patch using the optical sensor.
- the method may further include determining 406 from the sampling a relative coverage of the spot over the color blocks of the position calibration patch and based on the known geometry of the spot and on the determined relative coverage, determining 408 the position of the spot of the sensor with respect to the reference position.
- a method for determining the position of a spot of an optical sensor with respect to the reference position on the sheet may be used to continuously self- calibrate the cross-process position of an in-line densitometer sensor in the output print path of a high speed digital press.
- a position calibration patch may be provided periodically along the scan path of the optical sensor.
- a position calibration patch may be provided in front or within each color calibration strip of a plurality of color calibration strips provided on a sheet, when the existence of a plurality of jobs requires the use of a plurality of color calibration strips.
- a method and system for position calibration may rely solely on the sampled optical density values, and is based on the analysis of the optical properties of the position calibration patch and the geometrical properties of the sensor's spot. Such method or system is general enough to be embedded into or integrated with practically any printing device.
- Simple sampling facilitates performing position calibration for the sensor's spot continuously for each printed sheet, thus allowing color calibration patches to share the same spread with the position self-calibration pattern.
- a method and system for determining a position of a spot of an optical sensor of a known geometry traveling along a scan path across a sheet, with respect to a reference position on the sheet do not require the use of additional optical devices such as camera, scanner or a barcode reader, rendering such method and system less expensive than methods and systems that use additional optical devices.
- a method and system for determining a position of a spot of an optical sensor of a known geometry traveling along a scan path across a sheet seem also superior to another known solution for determining the position of the leading edge of the sheet, which involves using a low cost tracking sensor configured to track the leading edge only, which is prone to mis-registration due to misalignment between the sheet and the printed image on it.
- Employing a method (or system) for position calibration of the spot of the sensor may yield some advantages, among which are:
- a position calibration patch may be printed alongside the regular (customer's) printed job, so that it does not interrupt the regular run of that job.
- aspects of the invention may be embodied in the form of a system, a method, or a computer program product. Similarly, aspects of the invention may be embodied as hardware, software or a combination of both. Aspects of the invention may be embodied as a computer program product saved on one or more non-transitory computer readable medium (or mediums) in the form of computer readable program code embodied thereon. Such non-transitory computer readable medium may include instructions that when executed cause a processor to execute method steps in accordance with embodiments of the present invention. In some embodiments of the present invention the instructions stores on the computer readable medium may be in the form of an installed application and in the form of an installation package.
- the computer readable medium may be a non-transitory computer readable storage medium.
- a non-transitory computer readable storage medium may be, for example, an electronic, optical, magnetic, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof.
- Computer program code may be written in any suitable programming language. The program code may execute on a single computer, or on a plurality of computers.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Spectrometry And Color Measurement (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
- Cleaning In Electrography (AREA)
- Color Electrophotography (AREA)
- Facsimiles In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2011/059500 WO2012167825A1 (en) | 2011-06-08 | 2011-06-08 | System and method for position calibration of a spot of an optical sensor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2719157A1 true EP2719157A1 (en) | 2014-04-16 |
EP2719157B1 EP2719157B1 (en) | 2016-04-13 |
Family
ID=47292945
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11729392.8A Not-in-force EP2719157B1 (en) | 2011-06-08 | 2011-06-08 | System and method for position calibration of a spot of an optical sensor |
Country Status (4)
Country | Link |
---|---|
US (2) | US9124754B2 (en) |
EP (1) | EP2719157B1 (en) |
JP (1) | JP5758543B2 (en) |
WO (1) | WO2012167825A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018077445A1 (en) * | 2016-10-31 | 2018-05-03 | Hp Indigo B.V. | Calibration of a sensor |
CN114166118A (en) * | 2021-11-26 | 2022-03-11 | 哈尔滨工程大学 | Optical fiber shape sensing arrangement angle self-calibration method |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2659313B1 (en) * | 2011-02-28 | 2019-04-03 | Hewlett-Packard Development Company, L.P. | Printing |
JP5708062B2 (en) * | 2011-03-09 | 2015-04-30 | 株式会社リコー | Image forming apparatus and image density detection method |
WO2012167825A1 (en) * | 2011-06-08 | 2012-12-13 | Hewlett-Packard Indigo B.V. | System and method for position calibration of a spot of an optical sensor |
US9522530B1 (en) | 2016-04-04 | 2016-12-20 | Hfwi Ftt-Packard Development Company, L.P. | Printing apparatus |
JP2020153814A (en) * | 2019-03-20 | 2020-09-24 | 株式会社リコー | Spectral characteristic acquisition device |
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JP2000122184A (en) | 1998-10-21 | 2000-04-28 | Fuji Photo Film Co Ltd | Image analyzing and measuring instrument |
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JP2003251790A (en) | 2002-02-28 | 2003-09-09 | Toppan Printing Co Ltd | Correction method for color measuring position of printed matter, correction apparatus for color measuring position, color measuring instrument using them, printing press and inspection image |
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JP4284520B2 (en) * | 2003-12-02 | 2009-06-24 | 富士ゼロックス株式会社 | Image forming apparatus, calibration method, and program thereof |
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2011
- 2011-06-08 WO PCT/EP2011/059500 patent/WO2012167825A1/en active Application Filing
- 2011-06-08 US US14/123,005 patent/US9124754B2/en not_active Expired - Fee Related
- 2011-06-08 EP EP11729392.8A patent/EP2719157B1/en not_active Not-in-force
- 2011-06-08 JP JP2014513920A patent/JP5758543B2/en not_active Expired - Fee Related
- 2011-12-15 US US13/327,357 patent/US8736905B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018077445A1 (en) * | 2016-10-31 | 2018-05-03 | Hp Indigo B.V. | Calibration of a sensor |
US10836182B2 (en) | 2016-10-31 | 2020-11-17 | Hp Indigo B.V. | Calibration of a sensor |
CN114166118A (en) * | 2021-11-26 | 2022-03-11 | 哈尔滨工程大学 | Optical fiber shape sensing arrangement angle self-calibration method |
Also Published As
Publication number | Publication date |
---|---|
US9124754B2 (en) | 2015-09-01 |
US20120314232A1 (en) | 2012-12-13 |
JP5758543B2 (en) | 2015-08-05 |
US8736905B2 (en) | 2014-05-27 |
WO2012167825A1 (en) | 2012-12-13 |
JP2014522333A (en) | 2014-09-04 |
EP2719157B1 (en) | 2016-04-13 |
US20140092402A1 (en) | 2014-04-03 |
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